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By D. F. A. Edwards

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In a welldesigned instrument the deflection is proportional to the current, there­ fore the resistance values are in the ratio of the deflections. A correction can easily be made for the resistance of the galvanometer and shunt if required, but since this is usually at most a few thousand ohms it is not usually necessary. It is obvious that this method gives the most accurate results when the resistance being measured is nearly equal to that of the standard, for then the direct proportionality of the deflection with current will be more nearly exact for small differences in deflection.

Now Qn âç q = q0 e(-'/c*> therefore e ^ V =f~ Thus t è -Áð - loge "ïï^ whence R can be found if t and C are known. 6. MEASUREMENT OF LOW RESISTANCE The main difficulty in the accurate measurement of low resistances arises from the fact that the resistances of leads and contacts are no longer negligible. It is clear that while contact resistances of the order of, say, 0-001 Ù are negligible when resistances of 100 Ù or more are to be measured, they are of great importance when the resistance to be measured is of the order of 0-01 Ù.

Mention the order of accuracy to be expected on the various ranges. 3. Describe a precision modification of the Wheatstone bridge net­ work for the comparison of nearly equal resistances, stating the precautions to be observed for accurate results. 4. The resistances of the four arms of a Wheatstone bridge ABCDA are AB 1000 Ù, BC 1000 Ù, CD 749, DA 750 Ù. C. RESISTANCE 59 in a galvanometer of resistance 500 Ù between B and D if 20 V are applied between A and C. If the 749 Ù arm is highly inductive what precautions should be taken to safeguard the galvanometer?

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